1 /* 2 * Copyright 2008, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* Utilities for managing the dhcpcd DHCP client daemon */ 18 19 #include <stdio.h> 20 #include <stdlib.h> 21 #include <unistd.h> 22 #include <arpa/inet.h> 23 #include <netinet/in.h> 24 25 #include <cutils/properties.h> 26 27 static const char DAEMON_NAME[] = "dhcpcd"; 28 static const char DAEMON_PROP_NAME[] = "init.svc.dhcpcd"; 29 static const char HOSTNAME_PROP_NAME[] = "net.hostname"; 30 static const char DHCP_PROP_NAME_PREFIX[] = "dhcp"; 31 static const char DAEMON_NAME_RENEW[] = "iprenew"; 32 static const int NAP_TIME = 1; /* wait for 1 second at a time */ 33 /* when polling for property values */ 34 static char errmsg[100]; 35 36 /* 37 * Wait for a system property to be assigned a specified value. 38 * If desired_value is NULL, then just wait for the property to 39 * be created with any value. maxwait is the maximum amount of 40 * time in seconds to wait before giving up. 41 */ 42 static int wait_for_property(const char *name, const char *desired_value, int maxwait) 43 { 44 char value[PROPERTY_VALUE_MAX] = {'\0'}; 45 int maxnaps = maxwait / NAP_TIME; 46 47 if (maxnaps < 1) { 48 maxnaps = 1; 49 } 50 51 while (maxnaps-- > 0) { 52 usleep(1000000); 53 if (property_get(name, value, NULL)) { 54 if (desired_value == NULL || 55 strcmp(value, desired_value) == 0) { 56 return 0; 57 } 58 } 59 } 60 return -1; /* failure */ 61 } 62 63 static void fill_ip_info(const char *interface, 64 in_addr_t *ipaddr, 65 in_addr_t *gateway, 66 in_addr_t *mask, 67 in_addr_t *dns1, 68 in_addr_t *dns2, 69 in_addr_t *server, 70 uint32_t *lease) 71 { 72 char prop_name[PROPERTY_KEY_MAX]; 73 char prop_value[PROPERTY_VALUE_MAX]; 74 struct in_addr addr; 75 in_addr_t iaddr; 76 77 snprintf(prop_name, sizeof(prop_name), "%s.%s.ipaddress", DHCP_PROP_NAME_PREFIX, interface); 78 if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { 79 *ipaddr = addr.s_addr; 80 } else { 81 *ipaddr = 0; 82 } 83 snprintf(prop_name, sizeof(prop_name), "%s.%s.gateway", DHCP_PROP_NAME_PREFIX, interface); 84 if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { 85 *gateway = addr.s_addr; 86 } else { 87 *gateway = 0; 88 } 89 snprintf(prop_name, sizeof(prop_name), "%s.%s.mask", DHCP_PROP_NAME_PREFIX, interface); 90 if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { 91 *mask = addr.s_addr; 92 } else { 93 *mask = 0; 94 } 95 snprintf(prop_name, sizeof(prop_name), "%s.%s.dns1", DHCP_PROP_NAME_PREFIX, interface); 96 if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { 97 *dns1 = addr.s_addr; 98 } else { 99 *dns1 = 0; 100 } 101 snprintf(prop_name, sizeof(prop_name), "%s.%s.dns2", DHCP_PROP_NAME_PREFIX, interface); 102 if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { 103 *dns2 = addr.s_addr; 104 } else { 105 *dns2 = 0; 106 } 107 snprintf(prop_name, sizeof(prop_name), "%s.%s.server", DHCP_PROP_NAME_PREFIX, interface); 108 if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { 109 *server = addr.s_addr; 110 } else { 111 *server = 0; 112 } 113 snprintf(prop_name, sizeof(prop_name), "%s.%s.leasetime", DHCP_PROP_NAME_PREFIX, interface); 114 if (property_get(prop_name, prop_value, NULL)) { 115 *lease = atol(prop_value); 116 } 117 } 118 119 /* 120 * Start the dhcp client daemon, and wait for it to finish 121 * configuring the interface. 122 */ 123 int dhcp_do_request(const char *interface, 124 in_addr_t *ipaddr, 125 in_addr_t *gateway, 126 in_addr_t *mask, 127 in_addr_t *dns1, 128 in_addr_t *dns2, 129 in_addr_t *server, 130 uint32_t *lease) 131 { 132 char result_prop_name[PROPERTY_KEY_MAX]; 133 char daemon_prop_name[PROPERTY_KEY_MAX]; 134 char prop_value[PROPERTY_VALUE_MAX] = {'\0'}; 135 char daemon_cmd[PROPERTY_VALUE_MAX * 2]; 136 const char *ctrl_prop = "ctl.start"; 137 const char *desired_status = "running"; 138 139 snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result", 140 DHCP_PROP_NAME_PREFIX, 141 interface); 142 143 snprintf(daemon_prop_name, sizeof(daemon_prop_name), "%s_%s", 144 DAEMON_PROP_NAME, 145 interface); 146 147 /* Erase any previous setting of the dhcp result property */ 148 property_set(result_prop_name, ""); 149 150 /* Start the daemon and wait until it's ready */ 151 if (property_get(HOSTNAME_PROP_NAME, prop_value, NULL) && (prop_value[0] != '\0')) 152 snprintf(daemon_cmd, sizeof(daemon_cmd), "%s_%s:-h %s %s", DAEMON_NAME, interface, 153 prop_value, interface); 154 else 155 snprintf(daemon_cmd, sizeof(daemon_cmd), "%s_%s:%s", DAEMON_NAME, interface, interface); 156 memset(prop_value, '\0', PROPERTY_VALUE_MAX); 157 property_set(ctrl_prop, daemon_cmd); 158 if (wait_for_property(daemon_prop_name, desired_status, 10) < 0) { 159 snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for dhcpcd to start"); 160 return -1; 161 } 162 163 /* Wait for the daemon to return a result */ 164 if (wait_for_property(result_prop_name, NULL, 30) < 0) { 165 snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for DHCP to finish"); 166 return -1; 167 } 168 169 if (!property_get(result_prop_name, prop_value, NULL)) { 170 /* shouldn't ever happen, given the success of wait_for_property() */ 171 snprintf(errmsg, sizeof(errmsg), "%s", "DHCP result property was not set"); 172 return -1; 173 } 174 if (strcmp(prop_value, "ok") == 0) { 175 fill_ip_info(interface, ipaddr, gateway, mask, dns1, dns2, server, lease); 176 return 0; 177 } else { 178 snprintf(errmsg, sizeof(errmsg), "DHCP result was %s", prop_value); 179 return -1; 180 } 181 } 182 183 /** 184 * Stop the DHCP client daemon. 185 */ 186 int dhcp_stop(const char *interface) 187 { 188 char result_prop_name[PROPERTY_KEY_MAX]; 189 char daemon_prop_name[PROPERTY_KEY_MAX]; 190 char daemon_cmd[PROPERTY_VALUE_MAX * 2]; 191 const char *ctrl_prop = "ctl.stop"; 192 const char *desired_status = "stopped"; 193 194 snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result", 195 DHCP_PROP_NAME_PREFIX, 196 interface); 197 198 snprintf(daemon_prop_name, sizeof(daemon_prop_name), "%s_%s", 199 DAEMON_PROP_NAME, 200 interface); 201 202 snprintf(daemon_cmd, sizeof(daemon_cmd), "%s_%s", DAEMON_NAME, interface); 203 204 /* Stop the daemon and wait until it's reported to be stopped */ 205 property_set(ctrl_prop, daemon_cmd); 206 if (wait_for_property(daemon_prop_name, desired_status, 5) < 0) { 207 return -1; 208 } 209 property_set(result_prop_name, "failed"); 210 return 0; 211 } 212 213 /** 214 * Release the current DHCP client lease. 215 */ 216 int dhcp_release_lease(const char *interface) 217 { 218 char daemon_prop_name[PROPERTY_KEY_MAX]; 219 char daemon_cmd[PROPERTY_VALUE_MAX * 2]; 220 const char *ctrl_prop = "ctl.stop"; 221 const char *desired_status = "stopped"; 222 223 snprintf(daemon_prop_name, sizeof(daemon_prop_name), "%s_%s", 224 DAEMON_PROP_NAME, 225 interface); 226 227 snprintf(daemon_cmd, sizeof(daemon_cmd), "%s_%s", DAEMON_NAME, interface); 228 229 /* Stop the daemon and wait until it's reported to be stopped */ 230 property_set(ctrl_prop, daemon_cmd); 231 if (wait_for_property(daemon_prop_name, desired_status, 5) < 0) { 232 return -1; 233 } 234 return 0; 235 } 236 237 char *dhcp_get_errmsg() { 238 return errmsg; 239 } 240 241 /** 242 * Run WiMAX dhcp renew service. 243 * "wimax_renew" service shoud be included in init.rc. 244 */ 245 int dhcp_do_request_renew(const char *interface, 246 in_addr_t *ipaddr, 247 in_addr_t *gateway, 248 in_addr_t *mask, 249 in_addr_t *dns1, 250 in_addr_t *dns2, 251 in_addr_t *server, 252 uint32_t *lease) 253 { 254 char result_prop_name[PROPERTY_KEY_MAX]; 255 char prop_value[PROPERTY_VALUE_MAX] = {'\0'}; 256 char daemon_cmd[PROPERTY_VALUE_MAX * 2]; 257 const char *ctrl_prop = "ctl.start"; 258 259 snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result", 260 DHCP_PROP_NAME_PREFIX, 261 interface); 262 263 /* Erase any previous setting of the dhcp result property */ 264 property_set(result_prop_name, ""); 265 266 /* Start the renew daemon and wait until it's ready */ 267 snprintf(daemon_cmd, sizeof(daemon_cmd), "%s_%s:%s", DAEMON_NAME_RENEW, interface, interface); 268 memset(prop_value, '\0', PROPERTY_VALUE_MAX); 269 property_set(ctrl_prop, daemon_cmd); 270 271 /* Wait for the daemon to return a result */ 272 if (wait_for_property(result_prop_name, NULL, 30) < 0) { 273 snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for DHCP Renew to finish"); 274 return -1; 275 } 276 277 if (!property_get(result_prop_name, prop_value, NULL)) { 278 /* shouldn't ever happen, given the success of wait_for_property() */ 279 snprintf(errmsg, sizeof(errmsg), "%s", "DHCP Renew result property was not set"); 280 return -1; 281 } 282 if (strcmp(prop_value, "ok") == 0) { 283 fill_ip_info(interface, ipaddr, gateway, mask, dns1, dns2, server, lease); 284 return 0; 285 } else { 286 snprintf(errmsg, sizeof(errmsg), "DHCP Renew result was %s", prop_value); 287 return -1; 288 } 289 }
